<!DOCTYPE html>
<html>
<body>
<p>您可以通过 selected 属性预选择某些选项。</p>
<form action="/example/html/form_action.aspx">
<select name="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat" selected>Fiat</option>
<option value="audi">Audi</option>
</select>
<br><br>
<input type="submit">
</form>
</body>
</html>